Which of the following pathogens cause the disease pneumonia?
Salmonella typhi
S strain of Streptococcus pneumoniae
S and R strains of Streptococcus pneumoniae
Plasmodium vivax
Live S strain bacteria of the species Streptococcus pneumoniae are pathogenic, and can cause pneumonia.
The main reason for the virulent nature of the S strain of Streptococcus pneumoniae is the presence of: